Here is the map of wineries in Pinhão, Portugal that you can reach on foot.
You can travel to Pinhão by train and then arrange visits at the wineries not far from the station.
Quinta do Bomfim, Quinta da Foz and Quinta das Carvalhas are the closest to the Pinhão train station.
To help you with train trip planning and reservations, I have put together three itineraries that you can use to arrange your day trip to the Douro Valley.
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If you want to stay in Douro Valley and you are not renting a car, consider accommodation options near Pinhão train station.